Grinding machine



3 w. P. HUNT'EI' AL GRINDING MACHINE Filed Feb. 4, 1928 m'vz/v r025TTOENL'Y I mechanism including the invention, with the Patented June' 3,1930 UNITED STATES PATENT; OFFICE WILSON P. HUNT, CLARENCE W. HALLENE,AN D SAMUEL L. BRANDENIBURG; OF MOLINE,

ILLINOIS, ASSIGNORS TO MOLINE TOOL COMPANY, OF MOLINE, ILLINOIS GRINDINGmncnmn- Application filed February 4, 1928. Serial No. 251,906.

Qur invention has reference to an improvement in grindlng machines, andrelates more specially to multiple honing or. lapping ma- .chines, ofthat'type. which is. set forth in the.

former application of said Wilson P. Hunt for Letters Patent of theUnited States, filed October 17, 1927, Serial No. 226,717 These machinesinclude a series of grinding tools, each supported on the end of aspindle and designed for operation in the bore of an engine cylinder orsimilar. piece of work. It frequently happens that the axial line of thecylinder and that of the spindle do not true up exactly, calling for alittle variation of the position of the grinding tool with relation toits support. This has been usually secured by'means of a universaljoint-or other flexible connection between the spindle and tool,permitting a certain amount of flexibility to the action of the tool andenabling it to adapt itself readily to its work. One of the purposes ofthe present invention is to provideia rigid support for the grindingtool, but have the tool itself, or the grinding element thereof,independently supported, so as to be capable of instant and. automaticad-.

justment and adaptation to the walls of. the cylinder in which it isoperating.

v The invention includes a grinding mechanism in which the grindinelements are capable of being expanded y means of a cone and pinarrangement, and another purpose of the invention is to have the conemember suspended in the end of. a rigid mounting, so as to be permitteda limited shifting action independent thereof. By the presentconstruction and arrangement of the. device there is a considerablesaving in the cost of production thereof, through the elimination 'ofthe universal joints or other special connections abovereferred to. YThe improvements hereinafter set forth pertain to each of the unitarygrinding mechanisms of a multiple machine, and the same will be shownand described herein in its relation to one of such units.

In the drawings Fig. 1 is a general elevational view of a upper part invertical section.

Fig. 2-is a vertical section of the grinding tool on the broken line 22of Fig. 3.

Fig. 3 is a cross-section, on the broken line 3 3 of Fig. 2. a

The reference number 1 indicates a housing, comprising part of a generalmachine, in which is rotatably mounted'a spindle 2 driven by means ofgearingindicated at 3 and 4. Fixed in the lower end of the spindle is anextension 5, on the lower end of which 1 is a cylinder 6, provided withpairs of wings 7, forming vertical channels 8. Supported in sandchannels are frames 9, by means of pairs of pins 10 and 11, extendinginwardlycoiled springs 17 passing round theends of the frames, andengaged by recesses 18 therein. For use in the grinding operation eachof the frames 9 is fitted with a stone 19 of abrasive material, theouter faces of which stones 1 are spaced from eachother a suitabledistance to enable the same to be used in a bore of a specified size.

Supportedin the spindle 2 is arod 20, the lower end of which bearsagainst the cone-member 15 or against a. ball21 in the upper end of'saidmember, and overcoming frictional action betweentheflrod and conemember. Upon the rod 20 being forced downwardly the movement thereof .isim-- 13 and 14 to move downwardly, forcing the pins 10 and 11 outwardly,and expanding the frames 9- and grinding elements held thereby. By theuse of mechanical means, such as is indicated in part at 24;, thisexpansion can be made a gradual one, progressparted to the cone member,causing the cones ing as'the' honing operation proceeds, and

the diameter of the bore increases." The rod 20 is held normally in anelevated position,

and is returned thereto after being lowered, by means of a coiledspring'22 in a chamber in the'upper part of the spindle 2, and beam"-'ing a tubular ing against a pin 23 in the rod. Upon the downwardpressure upon the rod 20 bemg I grelieved the cone member is returnedftoan elevated position by the force of the pins 10 and '11 against thecones, induced by the springs 17. V 1 Y Instead of being formed to'fitsnugly in the cylinder 6 the guides 16*0f the cone memher are spaced alittle from the walls thereof, permitting a slight shifting of. the

grinders to one side or the other, and permitr ting the same to adaptthemselves exactly tothe work in which' they are engaged, The

, spacing of such parts is somewhat-exaggerated in the drawings, to moreclearly illustrate thesame. This eliminates any danger of the bore of acylinder being ground too much on one side, and at the same-time thereis a uniform ,amount of wear on the grinders,

20 by reason of the fact that they operate at all times with their facesin parallel relation with the axial line of the cylinder.

It will be understood that the connection.

between the -spindle 2 and extension 5ris of a rigid character, so thatthe rotation of said parts is on the same axial line throughout, theonly side play at the lower end thereof being in the cone member andgrinder supporting frames. In fact, in some adapta tionsthe spindlecould be of a continuous tubular formation. The tool can also beprovided with a single cone'device, and. other,

changes can be made in the coxksfiruction and arrangement of the parts,witho t departing herein. a

What we claim, Letters Patent, is:

1. In housing, a spindle rot-atably mounted theren, and provided with acylinder on one of 1ts ends provided with external longitudinal anddesire to secure by l channels, a cone member su ported in saidcylinder, and having a clearance from the sldes of the cylinderpermitting a limited lateral flexibility of the cone member, frames p insaid channels capable of radial expansion, contact members connectedwith said frames in engagement with the cones of said conefrom thespirit of the invention, as set forth 7 member, means for holding saidfraines frames mountedon the end of said tubular member sons to beradially movable, and

adapted for the support of grinding elements, a double cone member insaid tubular member and spaced therefrom so asto be capable of a limitedside play therein, connections betweensaid cone member and said.

frames serving as supports for the cone member, and operable t ereby tocause the expansion of said frames, means for holding said framesyieldably against the action of said cone member, and means forimparting a movement to said cone member longitudinally of the tubularmember to suitably expand said frames.

4. A device of the class described, comprising a spindle rotatablymounted, a tool head on'one end thereof having external frame guides,frames supported in said guides so as to be'radially expansible, a conemember in said tool head of slightlydess diameter than the bore of saidhead and capable of a limited side play therein, pins carried by saidframes in contact with said cone member and operable thereby to spreadsaid frames, means forholding said frames yieldably against the force ofsaid cone member, a rod carried by said spindle, bearing against saldcone member, and cap-able of imparting movement thereto to actuate saidframes, and.

means for holding said rod normally without pressureon said rod. 1

t In testimony-whereof we aifix our signaures.

WILSON P. HUNT. CLARENCE W. HALLENE. SAMUEL L.-BRANDENBURG.

device; of the class described, a i

said tubular member, aconedevide suspended spaced therefrom so as to 'becapable; of a limited slde play therein, and means for on said pins insaid tubularm'ember, and

holding said frames yieldablyin their inner most ositions. y

'3; 4 device of the class described,co nprisjn ember rotatably moupted,

